Java中Json字串的序列化與反序列化

元件：com.fasterxml.jackson

POM（局部）：

<logback.version>1.0.13</logback.version>
<jackson.version>2.3.1</jackson.version>

<dependency>
	<groupId>ch.qos.logback</groupId>
	<artifactId>logback-classic</artifactId>
	<version>${logback.version}</version>
</dependency>

<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
	<artifactId>jackson-databind</artifactId>
	<version>${jackson.version}</version>
</dependency>

程式碼：

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;

import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.Logger;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;

/**
 * Json序列化工具
 * 
 * @author http://blog.csdn.net/xxd851116
 * @date 2014年3月26日 下午1:21:59
 */
public class JsonUtils {
	private static final Logger logger = (Logger) LoggerFactory.getLogger(JsonUtils.class);

	private static ObjectMapper objectMapper = new ObjectMapper();

	/**
	 * 将对象序列化为JSON字符串
	 * 
	 * @param object
	 * @return JSON字符串
	 */
	public static String serialize(Object object) {
		Writer write = new StringWriter();
		try {
			objectMapper.writeValue(write, object);
		} catch (JsonGenerationException e) {
			logger.error("JsonGenerationException when serialize object to json", e);
		} catch (JsonMappingException e) {
			logger.error("JsonMappingException when serialize object to json", e);
		} catch (IOException e) {
			logger.error("IOException when serialize object to json", e);
		}
		return write.toString();
	}

	/**
	 * 将JSON字符串反序列化为对象
	 * 
	 * @param object
	 * @return JSON字符串
	 */
	public static <T> T deserialize(String json, Class<T> clazz) {
		Object object = null;
		try {
			object = objectMapper.readValue(json, TypeFactory.rawClass(clazz));
		} catch (JsonParseException e) {
			logger.error("JsonParseException when serialize object to json", e);
		} catch (JsonMappingException e) {
			logger.error("JsonMappingException when serialize object to json", e);
		} catch (IOException e) {
			logger.error("IOException when serialize object to json", e);
		}
		return (T) object;
	}

	/**
	 * 将JSON字符串反序列化为对象
	 * 
	 * @param object
	 * @return JSON字符串
	 */
	public static <T> T deserialize(String json, TypeReference<T> typeRef) {
		try {
			return (T) objectMapper.readValue(json, typeRef);
		} catch (JsonParseException e) {
			logger.error("JsonParseException when deserialize json", e);
		} catch (JsonMappingException e) {
			logger.error("JsonMappingException when deserialize json", e);
		} catch (IOException e) {
			logger.error("IOException when deserialize json", e);
		}
		return null;
	}
}

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